Thanks to Raúl for the heads up on this little snippet from Secretagentman. Now although he says "it's just a feeling", he has been proven correct a number of times in the past on his "feelings", which is why I've posted in spoilers instead of rumours. How great would a Black Rock Flashback be :)
My feeling regarding the two Brits is, and it's just a feeling, that it's for an old timey flashback. Maybe even Black Rock flashback?
Source: Secretagentman